<div class="demo">
  <div class="demo-space">
    <button nz-button nzType="primary" nzShape="circle">
      <span nz-icon nzType="search"></span>
    </button>
    <button nz-button nzType="primary" nzShape="circle">中</button>
    <button nz-button nzType="primary">
      <span nz-icon nzType="search"></span>
      搜索
    </button>
    <button nz-button nzShape="circle">
      <span nz-icon nzType="search"></span>
    </button>
    <button nz-button>
      <span nz-icon nzType="search"></span>
      搜索
    </button>
  </div>
  <div class="demo-space">
    <button nz-button nzShape="circle">
      <span nz-icon nzType="search"></span>
    </button>
    <button nz-button>
      <span nz-icon nzType="search"></span>
      搜索
    </button>
    <button nz-button nzShape="circle" nzType="dashed">
      <span nz-icon nzType="search"></span>
    </button>
    <button nz-button nzType="dashed">
      <span nz-icon nzType="search"></span>
      搜索
    </button>
  </div>
</div>
